Rotary mold.



No. 767,928. PATENTED AUG. 16, 1904.

J. C. DAVIS. ROTARY MOLD.

APPLICATION FILED JAN. 20, 1903.

-N0 MODEL.

UNITED STATES Patented August 16, 1904.

JAMES O. DAVIS, OF ST. LOUIS, MISSOURI.

ROTARY MOLD.

SPECIFICATION forming part of Letters Patent No. 767,928, dated August 1'6, 1904,

Application filed January 20, 1903. Serial No. 139.850. (No model.)

To all whom, t may con/007171,'.-

Be it known that I, JAMES O. DAvIs, a citizen of the United States of America, residing at St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Rotary Molds, of which the following is a specification.

My invention relates particularly to that class of molds in which articles of a general circular form are poured, and in which for any reason it is desired to rotate the mold during the pouring of the metal. Its objects are to provide such a mold with Ineans by which accidental spilling of the metal by reason of the centrifugal force exerted in rotating, may be avoided and the mold rendered safe from any such danger during the pouring operation. It also consists in certain novel structures and arrangements of parts, as hereinafter specified. In carrying out the objects of this invention I make use of the apparatus which I have illustrated in preferred form in the accompanying drawings, wherein,-

Figure l is a vertical section through the mold and flask, showing a molded car wheel in the iiasl and the guard rings thereon.

Figure 2 is a plan view of the same.

Figure 3 is a partial vertical section through a similar mold and car wheel, but having a different form of guard for the portion of the mold surrounding the hub and the pouring gate.

In carrying out the method of making castings which is set forth in my co-pending application No. 89,104, wherein the mold is rotated during the act of pouring the metal, I have found that sometimes the vents provided in the mold for escape of the gases from the pattern space allow the metal to iiy out, by reason of the centrifugal force, and sometimes scattering the metal about the mold rendering it both dangerous and non-economical. In order to avoid this difticulty I have provided the Hash and mold with certain devices illustrated, for the purpose of guarding the outlets for venting the gases.

When the two halves of the mold, a, are placed together there is ordinarily provided a series of vents e for the escape of the gases and air in the pattern space in the mold. The central space 7c is provided for the purpose of pouring the metal and is called the gate. Above the row of vents e I have placed an arched ring m. It is formed so as to cover the entire row of vents e and may be made either of cast metal or formed in a circular core block or a layer of sand on top of the mold as is most convenient. It is provided with a series of very small air vents g which are placed out of line with the vents e so that the two sets of holes do not in any case register with each other. In consequence of this construction if any of the metal from the mold is forced up through the air vents e it will strike the guard m and be prevented from Y escape, while the vent e affords easy escape of the air from the mold.

Also around the upper annular projecting parts of the mold such as the hub of the wheel I provide a series of air vents f and above this is placed a similar guard ring n, similarly provided with air vents g. This guard ring may also be of cast iron, but in general I prefer to form it from a core block as illustrated in Figure 3 and thereby render more easy the entrance to the pouring gate lo. It will be seen that an annular groove j) is provided in this block a and this is provided with air holes L which are very much smaller than the air vents f in mold proper.

The operation and use of this device will be apparent from the drawings and the above description. It is not essential to the invention that the air vents be in any particular position or the guard rings m and n be of any particular form.

But having thus described my invention, what I claim, and desire to secure by Letters Patent, is the following:

l. A rotatable mold provided with vents for the gases from the pattern space, and a guard having air vents therethrough, substantially as described.

2. A mold adapted to be rotated during the pouring of the metal therein and having an air vent above which is placed a guard to prevent escape of the metal through the air vent, substantially as described.

3. The combination with a niold having a circularly arranged series of air Vents therein, of a guard ring` provided With an annular chamber having air vents, said ring being placed over the vents of the mold but the perforations therein alternating in position With the air vents of the mold.

4;. The combination with a mold adapted to be rotated and havingl a circumferentially arranged series of air vents therein, of a perforated ring provided with an air chamber placed over the circumferentially arranged row of vents.

5. Arnold adapted to be rotated during the pouring of the metal and provided With air vents therein, and provided with a supplementary core block near the center of the mold having' an annular chamber thereunder to register With the series of air vents in the mold and being provided with air escapes in said block.

6. The combination with a mold for circular articles adapted to be rotated during the pouring of the metal and provided With a centrally disposed gate for pouring, and air vents arranged in a circle in said mold, of a guard ring With an annular space disposed above said circular-ly arranged perforations and provided with perforations placed alternately with the irst `named perforations.

7 The combination With a mold adapted to be rotated during the pouring of the metal, of a series of air vents in said mold and aseries of cover plates or guard rings placed over said air Vents in the mold and being provided with perforations out of line with the perforations in the mold, substantially as described.

In testimony whereof I have hereunto signed my name in the presence of two subscribed Witnesses.

JAMES C. DAVIS.

W'itnesses:

PAUL CARPENTER, EDWARD C. BURNS. 

